ESB Node Properties for Input/Output variables grows larger than panel when panel is resized.

To reproduce:

1.) Drag an ESB Service node on jBPM Diagram Pallette
2.) Click on (select) the new ESB Service node
3.) Select the Properties view tab
4.) Click the ESB subtab of the ESB Properties panel
5.) Click the "Input" subsubtab of the ESB subtab of the ESB Properties panel
6.) Grab the left edge of the "Properties" panel and move it to the left (increasing the width of the Properties panel)
7.) Note that the ESB Input sub panel grows wide faster than its Properties panel container such that you can no longer see the "Add" button in the ESB Input sub panel without scrolling.