Setting mmain tab visible=false
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1064)
        at org.netbeans.core.NbMainExplorer$MainTab.setVisible(NbMainExplorer.java:765)
        at org.netbeans.core.windows.view.ui.tabcontrol.StackLayout.showComponent(StackLayout.java:42)
        at org.netbeans.core.windows.view.ui.tabcontrol.TabbedContainer.showComponent(TabbedContainer.java:149)
        at org.netbeans.core.windows.view.ui.tabcontrol.TabbedContainer.stateChanged(TabbedContainer.java:143)
        at org.netbeans.core.windows.view.ui.tabcontrol.TabbedAdapter.stateChanged(TabbedAdapter.java:359)
        at org.netbeans.core.windows.view.ui.tabcontrol.DefaultTabSelectionModel.fireStateChanged(DefaultTabSelectionModel.java:188)
        at org.netbeans.core.windows.view.ui.tabcontrol.DefaultTabSelectionModel.setSelectedIndex(DefaultTabSelectionModel.java:61)
        at org.netbeans.core.windows.view.ui.tabcontrol.TabbedAdapter.setSelectedTopComponent(TabbedAdapter.java:117)
        at org.netbeans.core.windows.view.ui.TabbedHandler.setSelectedTopComponent(TabbedHandler.java:259)
        at org.netbeans.core.windows.view.ui.AbstractModeContainer.setSelectedTopComponent(AbstractModeContainer.java:99)
        at org.netbeans.core.windows.view.ui.AbstractModeContainer.setTopComponents(AbstractModeContainer.java:117)
        at org.netbeans.core.windows.view.ModeView.setTopComponents(ModeView.java:92)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:177)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:166)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewHierarchy(ViewHierarchy.java:97)
        at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:108)
        at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:240)
        at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:219)
        at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:155)
        at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:95)
        at org.netbeans.core.windows.Central.attachTopComponentsHelper(Central.java:1149)
        at org.netbeans.core.windows.Central.attachTopComponentsToSide(Central.java:1075)
        at org.netbeans.core.windows.Central.userDroppedTopComponents(Central.java:1338)
        at org.netbeans.core.windows.view.DefaultView.userDroppedTopComponents(DefaultView.java:572)
        at org.netbeans.core.windows.view.dnd.WindowDnDManager.performDrop(WindowDnDManager.java:676)
        at org.netbeans.core.windows.view.dnd.WindowDnDManager.tryPerformDrop(WindowDnDManager.java:566)
        at org.netbeans.core.windows.view.dnd.DropTargetGlassPane.drop(DropTargetGlassPane.java:342)
        at java.awt.dnd.DropTarget.drop(DropTarget.java:398)
        at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:542)
        at sun.awt.dnd.SunDropTargetContextPeer.access$800(SunDropTargetContextPeer.java:52)
        at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:805)
        at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:743)
        at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:29)
        at java.awt.Component.dispatchEventImpl(Component.java:3494)
        at java.awt.Container.dispatchEventImpl(Container.java:1627)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
        at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:3269)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3123)
        at java.awt.Container.dispatchEventImpl(Container.java:1613)
        at java.awt.Window.dispatchEventImpl(Window.java:1606)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)