Thanks for writing.
The reason for the undesired behavior that you experience is that when navigating through the items in the RadComboBox
control, the TextChanged
event is fired since the text is updated to reflect the currently selected item. The current implementation of this event in your code takes the text from the combo box (which will exactly match an item from the drop down), filters the options again, and thus only one item remains visible in the drop down.
In this case, you can use the KeyPress
event of the RadComboBox
instead and then apply the filtering. The KeyPress
event will not be fired when you navigate over the items in the drop down and therefore you will not face the issue described above.
I hope this is helpful.
You can write back anytime you need further assistance.
All the best,
the Telerik team