Use WidgetAdapter instead of deprecated IWidgetAdapter
diff --git a/bundles/org.eclipse.rap.nebula.widgets.grid/src/org/eclipse/nebula/widgets/grid/internal/gridcolumnkit/GridColumnLCA.java b/bundles/org.eclipse.rap.nebula.widgets.grid/src/org/eclipse/nebula/widgets/grid/internal/gridcolumnkit/GridColumnLCA.java
index 11f7808..6fe98c6 100644
--- a/bundles/org.eclipse.rap.nebula.widgets.grid/src/org/eclipse/nebula/widgets/grid/internal/gridcolumnkit/GridColumnLCA.java
+++ b/bundles/org.eclipse.rap.nebula.widgets.grid/src/org/eclipse/nebula/widgets/grid/internal/gridcolumnkit/GridColumnLCA.java
@@ -30,7 +30,7 @@
 import org.eclipse.rap.rwt.internal.util.NumberFormatUtil;
 import org.eclipse.rap.rwt.lifecycle.AbstractWidgetLCA;
 import org.eclipse.rap.rwt.lifecycle.ControlLCAUtil;
-import org.eclipse.rap.rwt.lifecycle.IWidgetAdapter;
+import org.eclipse.rap.rwt.lifecycle.WidgetAdapter;
 import org.eclipse.rap.rwt.lifecycle.ProcessActionRunner;
 import org.eclipse.rap.rwt.lifecycle.WidgetLCAUtil;
 import org.eclipse.rap.rwt.lifecycle.WidgetUtil;
@@ -179,7 +179,7 @@
     if( Arrays.equals( columnOrder, grid.getColumnOrder() ) ) {
       GridColumn[] columns = grid.getColumns();
       for( int i = 0; i < columns.length; i++ ) {
-        IWidgetAdapter adapter = WidgetUtil.getAdapter( columns[ i ] );
+        WidgetAdapter adapter = WidgetUtil.getAdapter( columns[ i ] );
         adapter.preserve( PROP_LEFT, null );
       }
     } else {
@@ -188,7 +188,7 @@
       } catch( IllegalArgumentException exception ) {
         // move the column in/out of a group is invalid
       } finally {
-        IWidgetAdapter adapter = WidgetUtil.getAdapter( column );
+        WidgetAdapter adapter = WidgetUtil.getAdapter( column );
         adapter.preserve( PROP_LEFT, null );
       }
     }