I have one wingrid bound to a BindingSource. The data are correctly shown in the grid at runtime.

One of the columns of the grid is a varchar key that need to be decoded in a lookup table. So, I have a second BindingSource containing a couple key+description from this table. The BindingSource can be bound to a dropdown or a combo (I tried both) and the control is used as an editor for the grid's column (the description is the displaymember, the key is the valuemember). All is ok and I can change the values using the dropdown combo.

A problem raise when I navigate the records of the grid using the mouse instead of the keybord: randomly, the cell containing the drop down show a null string instead of the correct value when I change the current row clicking with thw mouse on a different row. It happens this way:

• I am on a row and the text shown in the dropdown column is correct
• I change the current row clicking with the mouse on another row
• The row that have lost focus now have the text disappeared in the dropdown column (why?)
  
• I return to the previous row using only the keyboard and the text appear (is it only a wrong refresh problem?)
  

I tried different databases (mysq via odbc, access via oledb), different dropdown infragistics controls and binding methods (valuelist and editcontrol), but the bug is always there.

Is there a solution?