UPDATEĪs of, the article I linked to above is still active, but the blog hasn't been updated in a while. That's a very nice touch that the other Mutex solutions described here do not address. Second, the article shows how to bring the existing instance of the application to the foreground when the user tries to start another instance. But as it is, I do not use the Microsoft.VisualBasic assembly, and I'd rather not add an unnecessary dependency to my project. If my project already had a dependency on that assembly, I would probably advocate using the approach shown in another answer. The approach described by the article is advantageous for two reasons.įirst, it does not require a dependency on the Microsoft.VisualBasic assembly. Here is a very good article regarding the Mutex solution. But that is outside the scope of this answer. If you don't want that, then you will have to supply different templates for different levels of nodes. If you have third level nodes in the future, they also will be pulled to the left. Thus all of the child nodes will be pulled to the left a little. That means that its left margin is negative and thus spills out of the grid column containing it in the left direction. Pay special attention to the ItemsPresenter element named ItemsHost. This is just the simplest way to do it if you KNOW that there are not going to be any third level nodes. Not HierarchicalDataTemplate, but TreeViewItem template. While neither of the pages specifically say what to do, you are essentially changing the layout properties in the items presenter. I have also found this one to be pretty good to start out with. ![]() The following page, has a pretty good high level view of editing the Hierarchical Data Template. Sc#1, 0.004391443, 0.002428215, 0.242281124įor the complete sample, see Styling with ControlTemplates Sample.Really what you want to do is edit the HierarchicalDataTemplate and change the way it behaves. The preceding example uses one or more of the following resources. The following example shows how to define a ControlTemplate for the TreeView control and its associated types. The TreeViewItem is selected but not active. The mouse pointer is positioned over the TreeViewItem. The following table lists the visual states for TreeViewItem control. PartĪ visual element that contains that header content of the TreeView control. The following table lists the named parts for the TreeViewItem control. The Validation.HasError attached property is true has the control does not have focus. The Validation.HasError attached property is true has the control has focus. ![]() ![]() The control uses the Validation class and the Validation.HasError attached property is false. ![]() The following table lists the visual states for the TreeView control. If the ItemsPresenter is not the direct child of the ScrollViewer, you must give the ItemsPresenter the name, ItemsPresenter. (The ItemsPresenter displays each item in the TreeView the ScrollViewer enables scrolling within the control). When you create a ControlTemplate for an TreeView, your template might contain a ItemsPresenter within a ScrollViewer. The TreeView control does not have any named parts. For more information, see Create a template for a control. You can modify the default ControlTemplate to give the control a unique appearance. This topic describes the styles and templates for the TreeView control.
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