How to add image base tool control to a drop-down list in ArcGIS 9.3.1 In VS 2010 add-in solution right click on the solution and add ArcGIS Add-in component and then choose Tool Palette .At this stage you will get a tool palette that u can add tools on it or u can edit the esri add-in xml file by adding <ToolPalette> <Items> <Tool....