REPORT-74118 单元格数据源老模板切换到数据集数据并添加多分类，多分类不可修改

designer-chart/src/main/java/com/fr/van/chart/designer/data/VanChartMoreCateTableDataContentPane.java

@@ -22,13 +22,14 @@ public class VanChartMoreCateTableDataContentPane extends CategoryPlotMoreCateTa
     @Override
     public void populateBean(ChartCollection collection) {
         super.populateBean(collection);
-        VanChartRectanglePlot plot = (VanChartRectanglePlot) collection.getSelectedChart().getPlot();
+        VanChartRectanglePlot plot = collection.getSelectedChart().getPlot();
         isSupportMultiCategory = plot.isSupportMultiCategory();
         checkBoxList(isSupportMultiCategory);
     }
 
     protected void updateMoreCate(NormalTableDataDefinition normal, Plot plot) {
         super.updateMoreCate(normal, plot);
+        isSupportMultiCategory = ((VanChartRectanglePlot) plot).isSupportMultiCategory();
         ((VanChartPlot) plot).setCategoryNum(getBoxList().size() + 1);
         if (!getBoxList().isEmpty()) {
             plot.getDataSheet().setVisible(false);