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Combox drop down covers input box

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ComboBox and ListBox (obsolete as of Q2 2010)
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Mike asked on 06 Jun 2008, 06:30 PM
I am having an issue with the drop down portion of the combo box staying dropped after a selection is made and the selectedIndexChange event is fired.  
I am using the selectedIndexChanged event to pop up a input box asking the user to input a qty.  The drop down is not hiding when a selection is made.  It stays up in the way of the input box until the input box is completed. 

Here is my code. 

'Code for filing combobox.

drpModelNumber.AutoCompleteMode = AutoCompleteMode.Suggest

drpModelNumber.DataSource = oUnitsDT

drpModelNumber.DisplayMember =


'code for selected index

Private Sub drpModelNumber_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles drpModelNumber.SelectedIndexChanged


"Please Enter the Quantity", "Quantity", "", , )

End Sub

Any suggestions?

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Telerik team
answered on 09 Jun 2008, 04:11 PM
Hi Mike,

Thank you for writing.

We're sorry for the inconvenience. This is a known issue which has already been investigated. It concerns the internal system mechanism of displaying message boxes and other windows as the drop-down window. For the time being, we haven't found a complete solution and currently the drop-down windows remain visible until the message box is hidden.

Fortunately, there is a simple workaround:


You should add this line before showing the message box (or in your case - input box).

I hope this helps. If you have any additional questions, please don't hesitate to write us again.

Best wishes,
the Telerik team

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ComboBox and ListBox (obsolete as of Q2 2010)
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