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ava.lang.NullPointerException: 	at com.embarcadero.uml.ui.swing.drawingarea.ADDrawingAreaControl.enterModeFromButton(ADDrawingAreaControl.java:4773)	at com.sun.tools.ide.modeling.drawingarea.CreatePalette$PalettePropertyChangeListener.propertyChange(CreatePalette.java:135)	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270)	at org.netbeans.modules.palette.PalettePanel.setSelectedItem(PalettePanel.java:198)	at org.netbeans.modules.palette.PaletteCategoryDescriptor$1.valueChanged(PaletteCategoryDescriptor.java:75)	at javax.swing.JList.fireSelectionValueChanged(JList.java:1317)	at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1331)	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:187)	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:214)	at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:408)	at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:417)	at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:441)	at javax.swing.JList.setSelectionInterval(JList.java:1604)	at javax.swing.plaf.basic.BasicListUI$Handler.adjustSelection(BasicListUI.java:2316)	at javax.swing.plaf.basic.BasicListUI$Handler.adjustFocusAndSelection(BasicListUI.java:2275)	at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(BasicListUI.java:2256)	at javax.swing.plaf.basic.BasicListUI$MouseInputHandler.mousePressed(BasicListUI.java:1308)	at org.netbeans.modules.palette.CategoryList$CategoryListUI$ListMouseInputHandler.mousePressed(CategoryList.java:275)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:222)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)	at java.awt.Component.processMouseEvent(Component.java:5485)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)	at java.awt.Component.processEvent(Component.java:5253)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3955)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3889)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)	at java.awt.Container.dispatchEventImpl(Container.java:2010)	at java.awt.Window.dispatchEventImpl(Window.java:1774)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)