WinComboBox DropDown control

The WinComboBox control uses a GridControl as its dropdown control. This GridControl control can be accessed via the DropDownControl property. Unlike the other editors/controls (with the exception of the WinDatePicker and WinNumericTextBox controls), the combobox's dropdown cannot be replaced with another control.

Dropdown control

One of the advantages of using the GridControl class as the WinComboBox's dropdown is that the dropdown can be configured to act like a grid. For example, if you add a row to the dropdown control's FixedHeaderRows collection, you end up with a dropdown control that has a header which can be used to sort the items in the dropdown and display the column names (ColumnManagerRow).

VB.NET	Copy Code
Dim combo As New WinComboBox() combo.Columns.Add( New ColumnInfo( "Country", GetType( String ) ) ) combo.Columns.Add( New ColumnInfo( "Population", GetType( Integer ) ) ) combo.Columns.Add( New ColumnInfo( "City", GetType( String ) ) ) combo.Columns.Add( New ColumnInfo( "AverageTemp", GetType( String ) ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Canada", 31500000, "Ottawa", "12.2 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Switzerland", 7300000, "Bern", "23.3 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "France", 59500000, "Paris", "27.3 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "USA", 278000000, "Washington", "14.1 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "UK", 59700000, "London", "23.7 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Belgium", 10300000, "Brussels", "21.8 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Italy", 57700000, "Rome", "29.6 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Spain", 40000000, "Madrid", "31.8 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Germany", 83000000, "Berlin", "25.1 ºc" } ) ) combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Japan", 126800000, "Tokyo", "17.2 ºc" } ) ) combo.DropDownControl.FixedHeaderRows.Add( New Xceed.Grid.ColumnManagerRow() ) combo.Location = New Point( 10, 10 ) Me.Controls.Add( combo )

VB.NET

Copy Code

Dim combo As New WinComboBox() 

combo.Columns.Add( New ColumnInfo( "Country", GetType( String ) ) )

combo.Columns.Add( New ColumnInfo( "Population", GetType( Integer ) ) )      

combo.Columns.Add( New ColumnInfo( "City", GetType( String ) ) )

combo.Columns.Add( New ColumnInfo( "AverageTemp", GetType( String ) ) )      



combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Canada", 31500000, "Ottawa", "12.2 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Switzerland", 7300000, "Bern", "23.3 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "France", 59500000, "Paris", "27.3 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "USA", 278000000, "Washington", "14.1 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "UK", 59700000, "London", "23.7 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Belgium", 10300000, "Brussels", "21.8 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Italy", 57700000, "Rome", "29.6 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Spain", 40000000, "Madrid", "31.8 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Germany", 83000000, "Berlin", "25.1 ºc" } ) )

combo.Items.Add( New ComboBoxItem( New Object( 3 ){ "Japan", 126800000, "Tokyo", "17.2 ºc" } ) ) 

combo.DropDownControl.FixedHeaderRows.Add( New Xceed.Grid.ColumnManagerRow() ) 

combo.Location = New Point( 10, 10 )

Me.Controls.Add( combo )

C#	Copy Code
WinComboBox combo = new WinComboBox(); combo.Columns.Add( new ColumnInfo( "Country", typeof( string ) ) ); combo.Columns.Add( new ColumnInfo( "Population", typeof( int ) ) ); combo.Columns.Add( new ColumnInfo( "City", typeof( string ) ) ); combo.Columns.Add( new ColumnInfo( "AverageTemp", typeof( string ) ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Canada", 31500000, "Ottawa", "12.2 ºc" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Switzerland", 7300000, "Bern", "23.3 ºc" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "France", 59500000, "Paris", "27.3 ºc" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "USA", 278000000, "Washington", "14.1 ºc" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "UK", 59700000, "London", "23.7 ºc" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Belgium", 10300000, "Brussels", "21.8 c" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Italy", 57700000, "Rome", "29.6 ºc" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Spain", 40000000, "Madrid", "31.8 ºc" } ) ); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Germany", 83000000, "Berlin", "25.1 ºc" } )); combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Japan", 126800000, "Tokyo", "17.2 ºc" } ) ); combo.DropDownControl.FixedHeaderRows.Add( new Xceed.Grid.ColumnManagerRow() ); combo.Location = new Point( 10, 10 ); this.Controls.Add( combo );

Copy Code

WinComboBox combo = new WinComboBox();

combo.Columns.Add( new ColumnInfo( "Country", typeof( string ) ) );

combo.Columns.Add( new ColumnInfo( "Population", typeof( int ) ) );      

combo.Columns.Add( new ColumnInfo( "City", typeof( string ) ) );

combo.Columns.Add( new ColumnInfo( "AverageTemp", typeof( string ) ) );     

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Canada", 31500000, "Ottawa", "12.2 ºc" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Switzerland", 7300000, "Bern", "23.3 ºc" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "France", 59500000, "Paris", "27.3 ºc" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "USA", 278000000, "Washington", "14.1 ºc" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "UK", 59700000, "London", "23.7 ºc" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Belgium", 10300000, "Brussels", "21.8 c" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Italy", 57700000, "Rome", "29.6 ºc" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Spain", 40000000, "Madrid", "31.8 ºc" } ) );

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Germany", 83000000, "Berlin", "25.1 ºc" } ));

combo.Items.Add( new ComboBoxItem( new object[ 4 ]{ "Japan", 126800000, "Tokyo", "17.2 ºc" } ) );

combo.DropDownControl.FixedHeaderRows.Add( new Xceed.Grid.ColumnManagerRow() );

combo.Location = new Point( 10, 10 );

this.Controls.Add( combo );