We are working with a custom TreeDropDownList.  Here is the config file declaration:

 

<item type="treedropdown" name="Fields" text="Merge Fields" width="200" command="PasteHTML" />

 

The code is generating a two-level list of tables and columns for use in mail merge operations.  Ideally we would like to have the drop down panel be sized around 250 pixels by 200 pixels.  Currently it is 125 x 160, which is way too small, especially horizontally.  The information scrolls out of view.

 

Is there any way to do this programatically or through a setting in the configuration file?