In the project joined, i have a content pane with buttons which header text is "buttons". I want the user only to drag and drop it for it to be docked top/bottom (what i did), left and right docking is not allowed. I want the height of this content pane not to be greater than 50. So i tried to set MaxHeightProperty of the content pane, but the user can move splitter more than 50 and it is not the wanted behaviour. Then i set the maxheight of the slipper and it worked until i dock it to top where the maxHeight property do not keep that value.

I can understand that allowing user to dock left/right or in a tabgroup would not be a good idea and i have made it not to be possible in the project.

Now i hope to be more precise.

sofianea said:

I want the user only to drag and drop it for it to be docked top/bottom (what i did),

Actually no, what you did was restrict the edge of the dockmanager that it could be docked to but that doesn't mean that it can't be joined with other panes that are docked to the top/bottom edge (i.e. positioned in the top/bottom to the left/right side of an existing pane). If you want to prevent that then you would have to handle the PaneDragOver event and selectively indicate that certain actions are invalid. Then you can handle the PaneDragEnded and set the Height of the containing splitpane knowing that its docked alone. I've attached a modified version of your sample that does this. For simplicity sake I did this based on the Name property but you can alter this to fit your needs - maybe setting some custom attached property you define on the ContentPane. Note because of the requirements this means that the end user will only be able to position the pane using the global docking indicators since in all other cases the drop would result in the pane being a sibling of another pane.