Robert Brodt Messages: 811 Registered: August 2010 Location: Colorado Springs, CO
Currently the only way to remove a palette "drawer" is to disable all of the model elements individually. It sounds like this is the approach you have taken but I'm not sure why DataStore will not go away. You can try disabling the model elements one-by-one from the Project Properties dialog->BPMN2->Tool Enabled and restart the editor until the drawer disappears.
The Tool Enablement project preference looks like this:
Be sure to enable the "Override" checkbox and click the "Copy" button at the bottom.
The toolpalette configuration still needs work, so feel free to submit an enhancement request!