Question

I have created a custom button that has a boolean flag on it to say whether it is selected or not. If it is selected i want to change the background color of the button to allow the user to know what control they are looking at quickly. The problem is that i can not get the trigger to work correctly. Everything that i have seen on here, i have tried but i still get errors during the InitializeComponent section of my code.

Here are the properties that i am dealing with

Private mIsSelected As Boolean = False
Public Property IsSelected() As Boolean
    Get
        Return mIsSelected
    End Get
    Set(ByVal value As Boolean)
        mIsSelected = value
    End Set
End Property


Public Shared ReadOnly MyBackgroundProperty As DependencyProperty = DependencyProperty.Register("MyBackground",
                                                                                                GetType(LinearGradientBrush), GetType(RentAdjButtons),
                                                                                                    New PropertyMetadata(New LinearGradientBrush(ColorConverter.ConvertFromString("#3366CC"), ColorConverter.ConvertFromString("#0000FF"), New System.Windows.Point(0.5, 0), New System.Windows.Point(0.5, 1))))


Private mMyBackground As New LinearGradientBrush
Public Property MyBackground() As LinearGradientBrush
    Get
        Return mMyBackground
    End Get
    Set(ByVal value As LinearGradientBrush)
        mMyBackground = value
    End Set
End Property

and here is my XMAL

 <Style TargetType="Com:RentAdjButtons">
            <Setter Property="MyBackground" Value="{StaticResource DefaultBackground}" />
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="MyBackground" Value="{StaticResource SelectedButton}" />
                </Trigger>
            </Style.Triggers>
       </Style>

Currently the error i am getting is “Property can not be null on Trigger”

Thank you in advance for any assistance

Answer 1

You can use ToggleButton which has this property by default.