!5 修正 UCDataGridView.LoadColumns() 时，panRow 还保存着上次的纪录

Merge pull request !5 from 熊本熊kumamon/master

HZH_Controls/HZH_Controls/Controls/DataGridView/UCDataGridView.cs

@@ -391,6 +391,7 @@ namespace HZH_Controls.Controls
                 { return; }
                 { return; }
 
 
                 ControlHelper.FreezeControl(this.panHead, true);
                 ControlHelper.FreezeControl(this.panHead, true);
+                this.panRow.Controls.Clear();
                 this.panColumns.Controls.Clear();
                 this.panColumns.Controls.Clear();
                 this.panColumns.ColumnStyles.Clear();
                 this.panColumns.ColumnStyles.Clear();