enabled resizing observer wizard shell

de.bmotionstudio.gef.editor/src/de/bmotionstudio/gef/editor/action/BMotionObserverWizardDialog.java

@@ -17,6 +17,7 @@ public class BMotionObserverWizardDialog extends BMotionAbstractWizardDialog {
 	public BMotionObserverWizardDialog(IWorkbenchPart workbenchPart, IWizard newWizard) {
 		super(workbenchPart, newWizard);
 		setShellStyle(SWT.CLOSE);
+		setShellStyle(SWT.RESIZE);
 		setDeleteToolTip("Delete Observer");
 	}