I have the following code and I'm wondering why, when I put it into the "BeforeCellListDropDown" the list doesn't drop down.  What is another event that is good to refresh the list before the user see's it?  I'm using .net UserControls and when they go to a different user control and change data there and then come back to the first control I need the drop down to refresh.  If the user changes data in the other user control then the contents of the list will be different.

this.ultraGrid1.DisplayLayout.Bands[0].Columns["Bin"].Style = Infragistics.Win.UltraWinGrid.ColumnStyle.DropDownList;
Infragistics.Win.UltraWinGrid.UltraDropDown uddBins = new Infragistics.Win.UltraWinGrid.UltraDropDown();
uddBins.ValueMember = "Bin";
uddBins.DisplayMember = "Bin";
uddBins.DataSource = GetBinListStartingLocation();
this.ultraGrid1.DisplayLayout.Bands[0].Columns["Bin"].ValueList = uddBins;