arcgis 10.0 - Handling mouse events for tool called by button?

I have a dockable window with a 2 buttons that call 2 different tools (Draw Marker and Select Features), What i want to happen is when the user clicks on the relevant button on the dockable window and then clicks on the map, a onMouseUp event is called and it runs code i need to run.

Where does the onMouseUp event need to be placed so this can be done?