You can use the EditorInitialized event to show the popup. Here is the code:
private void RadPropertyGrid1_EditorInitialized(object sender, PropertyGridItemEditorInitializedEventArgs e)
if (e.Editor is PropertyGridDropDownListEditor)
var editor = e.Editor as PropertyGridDropDownListEditor;
var element = editor.EditorElement as BaseDropDownListEditorElement;
I hope this helps. Should you have any other questions, do not hesitate to ask.
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