import jetbrains.mps.ide.ui.smodel.SModelTreeNode;
import jetbrains.mps.ide.ui.MPSTreeNode;
import jetbrains.mps.ide.ui.MPSTree;
import jetbrains.mps.ide.ui.TextTreeNode;
import jetbrains.mps.ide.AbstractActionWithEmptyIcon;
<BUG>import jetbrains.mps.util.CollectionUtil;
import javax.swing.JPanel;</BUG>
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;

import jetbrains.mps.ide.ui.smodel.SModelTreeNode;
import jetbrains.mps.ide.ui.MPSTreeNode;
import jetbrains.mps.ide.ui.MPSTree;
import jetbrains.mps.ide.ui.TextTreeNode;
import jetbrains.mps.ide.AbstractActionWithEmptyIcon;
import jetbrains.mps.util.CollectionUtil;
import jetbrains.mps.util.Pair;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
