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Panel.InternalChildren Property

Gets a UIElementCollection of child elements.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

'Declaration
Protected Friend ReadOnly Property InternalChildren As UIElementCollection

Property Value

Type: System.Windows.Controls.UIElementCollection
An ordered collection of UIElement objects. This property has no default value.

The returned collection includes items that are added directly in code, and also items that are generated by data binding.

Classes that are derived from Panel should use this property, instead of the Children property, for internal overrides such as MeasureCore and ArrangeCore.

This example shows how to override the default layout behavior of the Panel element and create custom layout elements that are derived from Panel.

The example defines a simple custom Panel element called PlotPanel, which positions child elements according to two hard-coded x- and y-coordinates. In this example, x and y are both set to 50; therefore, all child elements are positioned at that location on the x and y axes.

To implement custom Panel behaviors, the example uses the MeasureOverride and ArrangeOverride methods. Each method returns the Size data that is necessary to position and render child elements.

Public Class PlotPanel
    Inherits Panel
    'Override the default Measure method of Panel. 

    Protected Overrides Function MeasureOverride(ByVal availableSize As System.Windows.Size) As System.Windows.Size
        Dim panelDesiredSize As Size = New Size()
        ' In our example, we just have one child.  
        ' Report that our panel requires just the size of its only child. 
        For Each child As UIElement In InternalChildren
            child.Measure(availableSize)
            panelDesiredSize = child.DesiredSize
        Next 
        Return panelDesiredSize
    End Function 
    Protected Overrides Function ArrangeOverride(ByVal finalSize As System.Windows.Size) As System.Windows.Size
        For Each child As UIElement In InternalChildren
            Dim x As Double = 50
            Dim y As Double = 50
            child.Arrange(New Rect(New System.Windows.Point(x, y), child.DesiredSize))
        Next 
        Return finalSize
    End Function 
End Class

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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