I can expose a DataGridComboBoxColumn on a grid, but the user must click it twice to show its drop-down list (the first is to gain focus and enter in edit-mode).
How can I force programatically to show the drop-down list?
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Not the exact answer to your actual question, but since the issue seems to be the need to click twice, this blog post might help. It includes a sample to enable Single-click Editing in a DataGrid.
Glorfindel
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Hans Olsson
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1It didn't work for row-based selection. Still have to make two clicks to get the list shown. Anyway, thanks. – Néstor Sánchez A. Jun 15 '10 at 18:35