Gets or sets a value indicating whether the selection highlight spans the width of the tree view control.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
When ShowLines is set to true.is true, a selection highlight spans the entire width of the tree view, display instead of the width of just the tree node label. The property is ignored if
The following code example illustrates a customized TreeView. By inheriting the TreeView class, this custom version has all the functionality of a typical TreeView. Changing various property values in the constructor provides a unique appearance. Because the ShowPlusMinus property is set to false, the customized control also overrides the OnAfterSelect method so nodes can be expanded and collapsed when they are clicked.
A control that is customized in this way can be used throughout an organization, making it easy to provide a consistent interface without requiring the control properties to be specified in each individual project.
Public Class CustomizedTreeView Inherits TreeView Public Sub New() ' Customize the TreeView control by setting various properties. BackColor = System.Drawing.Color.CadetBlue FullRowSelect = True HotTracking = True Indent = 34 ShowPlusMinus = False ' The ShowLines property must be false for the FullRowSelect ' property to work. ShowLines = False End Sub 'NewNew Protected Overrides Sub OnAfterSelect(ByVal e As TreeViewEventArgs) ' Confirm that the user initiated the selection. ' This prevents the first node from expanding when it is ' automatically selected during the initialization of ' the TreeView control. If e.Action <> TreeViewAction.Unknown Then If e.Node.IsExpanded Then e.Node.Collapse() Else e.Node.Expand() End If End If ' Remove the selection. This allows the same node to be ' clicked twice in succession to toggle the expansion state. SelectedNode = Nothing End Sub 'OnAfterSelect End Class 'CustomizedTreeView
Available since 1.1