[Solved] Applying a theme to a RadMultiColumnComboBoxElement

[Ricardo Romo]

Hi,

I am applying a theme to the dropDownElement of a RadMulticolumnComboBox column. But it is not applyed until the second time the dropDownElement is displayed. How can I do it to apply it all the times, including the first time.

I have tried to do this in two events. Here is the code if I use CellEditorInitialized:

Private Sub Grid_CellEditorInitialized(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.GridViewCellEventArgs) Handles Grid.CellEditorInitialized

    If e.Row.Cells(e.ColumnIndex).ColumnInfo.Name = "multiComboGrupo" Then

            Dim editor As RadMultiColumnComboBoxElement = CType(Grid.ActiveEditor, RadMultiColumnComboBoxElement)
            editor.EditorControl.ThemeName = "UYA_Multicolu"
    End if

End Sub

I even tryed with CellBeginEdit event:

Private Sub Grid_CellBeginEdit(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.GridViewCellCancelEventArgs) Handles Grid.CellBeginEdit

    If Grid.CurrentRow.Cells(e.ColumnIndex).ColumnInfo.Name = "multiComboGrupo" Then
            Dim editor As RadMultiColumnComboBoxElement = CType(Grid.ActiveEditor, RadMultiColumnComboBoxElement)
            editor.EditorControl.ThemeName = "UYA_Multicolu"
    End if

End Sub

Thank you.

[Emanuel Varga]

Hello Ricardo,

First i have to ask, are you trying to use a different themes / controls, or a theme for the entire application? If you are trying to use just one theme for the entire app, you can just set the theme in the ThemeResolutionService, like so:

ThemeResolutionService.ApplicationThemeName = "Desert";

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga
Telerik WinForms MVP

[Ricardo Romo]

Hi!

Thank you for answer. I am applying different themes for controls. Not for the entire application. It works, but until the second time the dropdown element is showed.

I also loaded the thems from files in RadThemeManager for the form where I have the RadGridView with the MultiColumnComboBox Column.

Thank you for your help.

[Stefan]

Hello Ricardo,

Thank you for writing.

The observed behavior is caused by the fact that our theming mechanism works per control, but not per element. You can't set a theme to RadMultiColumnComboBox different than the theme of its dropdown element.

However, the desired behavior can be achieved by setting a theme to the embedded control instead of its element. Please refer to the following code snippet:

Dim editor As New RadMultiColumnComboBoxElement
Private Sub Grid_CellEditorInitialized(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.GridViewCellEventArgs) Handles RadGridView1.CellEditorInitialized
    If e.Row.Cells(e.ColumnIndex).ColumnInfo.Name = "OrderID" Then
        editor = CType(RadGridView1.ActiveEditor, RadMultiColumnComboBoxElement)
        AddHandler editor.PopupOpened, AddressOf PopUpOpenedEvent

    End If
End Sub
Private Sub PopUpOpenedEvent()
    editor.EditorControl.ThemeName = "HighContrastBlack"
End Sub

I hope the provided information addresses your question. Should you need any further assistance, do not hesitate to contact me.

Regards,
Stefan
the Telerik team