Hi,

The DropDownWidth property setting seems to have worked just fine here. The DropDown is 300 picels wide.

I suspect what you want to do is make the dropdown column 300 pixels width, though, not the dropdown windows itself.

So you can do that the same way you would do it in the grid. I recommend using the InitializeLayout event of the UltraDropDown control and then you can set:

e.Layout.Bands[0].Columns["Vaule"].Width = 300;

The DropDownWidth will size to the column width(s) by default, so you do not need to set DropDownWidth.