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.NET and JavaScript UI Controls
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Preventing Drop-Down Menu from Displaying

This topic applies to the following WinEditor™ controls:

  • WinComboEditor™

  • WinDateTimeEditor™

  • WinFontNameEditor™

  • WinCheckEditor™

In certain situations you may only want to allow users to change values in the drop-downs using the arrow keys and not allow the drop-down portion of a combo to display. To prevent a drop-down of the combo portion of the element from occurring, you simply cancel the BeforeDropDown event.

Each drop-down in the sample project has a checkbox associated with it. If the checkbox is checked then setting

e.cancel = True
will prevent the drop-down from displaying.

In Visual Basic:

Private Sub UltraComboEditor1_BeforeDropDown(ByVal sender As Object, _
  ByVal e As System.ComponentModel.CancelEventArgs) _
  Handles UltraComboEditor1.BeforeDropDown
	If Me.UltraCheckEditor1.Checked Then
		e.Cancel = True
	End If
End Sub

In C#:

private void ultraComboEditor1_BeforeDropDown(object sender,
  System.ComponentModel.CancelEventArgs e)
{
	if(this.ultraCheckEditor1.Checked)
		e.Cancel = true;
}