Simple ArcMap Add-In is required

I am requiring an ArcMap add-in that displays a toolbar consisting of a check-box and a tool. When the checkbox is enabled, a dockable window shall be displayed. The tool shall enable the user to select a polygon or polygons in the map and consequently display the photos related to the selected polygon/polygons. In the polygon feature class, their is a field named "Photo" that stores the name of the photo related to each polygon. Both the photos path string and polygon feature class name can be hardcoded. The photo/photos should still be displayed even after the user clicked another button or tool in ArcMa