Not able to make GridViewComboBoxColumn editing to work

[Albert]

The requirement is to have a dropdown of string collection which can be different from row to row. So I used ItemsSourceBinding according to the document. But the combox didn't show up when I clicked the cell.

<telerik:GridViewComboBoxColumn Header="Reason"
DataMemberBinding="{Binding MyReason}"
HeaderCellStyle="{StaticResource GridHeaderStyle}"
ItemsSourceBinding="{Binding ValidReasons}"
IsComboBoxEditable="True"
EditTriggers="CurrentCellClick"
IsReadOnly="False"
GroupMemberPath="Check"
/>

"GroupMemberPath" was there before. I added "IsComboBoxEditable", "EditTriggers" and "IsReadOnly" and found nothing changed. I assumed that IsComboBoxEditable can be used if the reason is not found in "ValidReasons".

[Dinko | Tech Support Engineer]

Hello Albert,

Thank you for the provided code snippet.

I am not sure why Combobox is not visible in your application. To test this, I have created one on my side, and the combo box control appears when the cell is in edit mode. Can you check the attached project and let me know what I am missing from your implementation to reproduce this behavior?

I am looking forward to your reply.

Regards,
Dinko
Progress Telerik

[Albert]

Hi Dinko,

Thanks for the reply. Later on I realized that the style used by grid has readonly specified. Once I made the grid readonly as false, I was able to see the ComboxBox. 

I have two other questions related -

1) The dropdown arrow is not visible by default. Is there a way to always display the dropdown arrow.

2) I can type letter into combobox in the test app, but only backspace key is effective when the component integrated into the application. Any hint how to check why the keyboard is not working?

Regards,

Albert

[Dinko | Tech Support Engineer]

Hello Albert,

1) The dropdown arrow is not visible by default. Is there a way to always display the dropdown arrow?

The RadComboBox control will be visible only in edit mode. To show the dropdown button you will need to use regular RadComboBox control and placed it inside CellTemplate of a column. I have modified the project to demonstrate this approach.

2) I can type letter into combobox in the test app, but only backspace key is effective when the component is integrated into the application. Any hint how to check why the keyboard is not working?

You can check if you have custom logic somewhere that handles key input in your application.  You can try to isolate it by removing parts of your code.

Regards,
Dinko
Progress Telerik