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Tips
Did you know you can nest a DockModel in another DockModel? Just drag and drop a DockModel on a page.
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Facts
PlusDock has a unique nested model architecture
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PlusDock is the ultimate windows docking system for Microsoft .Net Framework and Visual Studio .Net
PlaceHolder
PlusDock > Features > PlaceHolder
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The PlaceHolder is actually a class derived from DockPanel, the class that all panels hosted in the DockModel derive from. The idea behind the DockPanelPlaceHolder is to give the developer the ability to "reserve" areas in the docking surface.During the life of the application the placeholder can be replaced by other panels. A typical use for the DockPanelPlaceholder is when the DockPanelDocument class has the KeepPlaceOnClose property set to true. In this case, when the user closes the last open document window, the document panel is immediately replaced by a DockPanelPlaceholder. 


Document window replaced by a PlaceHolder
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