--- /dev/null
+package org.simantics.diagram.symbollibrary.ui;\r
+\r
+import org.eclipse.swt.widgets.Control;\r
+import org.simantics.diagram.symbollibrary.ISymbolGroup;\r
+import org.simantics.g2d.gallery.GalleryViewer;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+final class SymbolLibraryKeys {\r
+\r
+ /**\r
+ * SWT control data storage key for storing an {@link ISymbolGroup} within a\r
+ * symbol group {@link Control}.\r
+ */\r
+ public static final String KEY_GROUP = "group";\r
+\r
+ /**\r
+ * SWT control data storage key for storing a {@link GalleryViewer} within a\r
+ * symbol group {@link Control}.\r
+ */\r
+ public static final String KEY_GALLERY = "gallery";\r
+\r
+}\r