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2007/9/12 -When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control of the main MDI container form." I know ...

2016/6/25 -Additional information: Invalid parent form. When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control ...

2016/6/26 -Additional information: Invalid parent form. When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control ...

2013/3/13 -"Invalid parent ... When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control of the main MDI container ...

2021/2/1 -I have am MDI parent form (FrmMain) that displays an mdi child (FrmSearch) on loading. The parent form has a menustrip at the top

2020/9/22 -When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control of the main MDI container form. 处理方式 ...

2009/12/22 -Invalid parent form. When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control of the main MDI ...

2009/12/22 -Invalid parent form. When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control of the main MDI ...

2011/6/10 -Using the DocumentManager control in the MDI parent the dock panel can be docked to it to occupy the entire form. I use dock panels in MDI child ...

... Invalid parent form. When using DockingMdi or SystemMdi document style, the DockPanel control must be the child control of the main MDI container form.」 ...