Thank you for writing.
Before getting to your question I would like to discuss your license with you. Please note, that in order to continue receiving support from Telerik representatives, you have to be added as Licensed developer to an active license with support subscription. I can see that in your account you have such a license and it is assigned to firstname.lastname@example.org
. If you are also working with our controls, you should consider a purchase of an additional license, and assign yourself as license developer to it.
I have converted this forum thread into a support ticket in order to prevent disclosure of private information. You can find it in your Telerik account.
As to your question at hand, you can use the CellEditorInitialized event, where you can access the editor of the combo column. Once you access it, you can use its PopupOpening event to prevent the opening of the dropdown, and use the Click event of the ArrowButton to open your form:
sender, GridViewCellEventArgs e)
RadDropDownListEditor editor = (RadDropDownListEditor)e.ActiveEditor;
RadDropDownListEditorElement element = (RadDropDownListEditorElement)editor.EditorElement;
element.PopupOpening += element_PopupOpening;
element.ArrowButton.Click += ArrowButton_Click;
sender, EventArgs e)
sender, CancelEventArgs e)
I hope that you find this information useful. Let me know if you have any other questions.
the Telerik team