Silverlight animating PopupMenu–‘IsOpen’ property, translate transform and opacity

This sample shows how to animate System.Windows.Controls.Primitives.Popup ‘IsOpen’ property, its position and opacity.

To change the visual state from code behind use:

VisualStateManager.GoToState(this, "HiddenState", true);

VisualStateManager.GoToState(this, "VisibleState", true);

source code.

Using StringFormat in Binding

I had a problem using string format for a simple task of just "following the string from Binding with a ‘:’ sign. This can accomplished with:

Content="{Binding a,Source={StaticResource b}, StringFormat='{}{0}:'}"

Don’t forget the ‘’ signs.

Silverlight set Binding to property from code-behind or ViewModel

There is a static class BindingOperations which has a method called SetBinding().

BindingOperations.SetBinding(targetObject, TargetObjectClass.AttachableProperty, new Binding());

Where:

targetObject – is the instance of the object we bind to
TargetObjectClass.AttachableProperty – is the static reference to the propety we want to bind from
new Binding() – is the Binding with the Path and Source properties appropriately set.

Sample usage is:

BindingOperations.SetBinding(observableResources,ObservableResources.CurrentCultureProperty, new Binding() { Path = new PropertyPath("CurrentCulture"), Source = LanguageManager, Mode = BindingMode.TwoWay});

You can also use:

targetObject.SetBinding(TargetObjectClass.AttachableProperty, new Binding());

Silverlight sdk:DataGrid Column Header DataBinding; How to set DataBinding in Column Header in Silverlight

There is a problem with setting DataBinding as a Header in Column (e.g. DataGridTextColumn) from Silverlight Client SDK. Unfortunately Header is not a dependency property, do binding to it will result in converting DataBinding to string (calling its ToString() method).

“System.Windows.Data.Binding”

To overcome the problem create a helper with a Dependency property (e.g. HeaderBinding). Change to HeaderBinding binding should set the real Header string.

Usage:

<sdk:DataGridTextColumn Controls:DataGridColumnHelper.HeaderBinding="{Binding Something” />

 

Helper:

public static class DataGridColumnHelper
{
    public static readonly DependencyProperty HeaderBindingProperty = DependencyProperty.RegisterAttached(
        "HeaderBinding",
        typeof(object),
        typeof(DataGridColumnHelper),
        new PropertyMetadata(null, DataGridColumnHelper.HeaderBinding_PropertyChanged));

    public static object GetHeaderBinding(DependencyObject source)
    {
        return (object)source.GetValue(DataGridColumnHelper.HeaderBindingProperty);
    }

    public static void SetHeaderBinding(DependencyObject target, object value)
    {
        target.SetValue(DataGridColumnHelper.HeaderBindingProperty, value);
    }

    private static void HeaderBinding_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        DataGridColumn column = d as DataGridColumn;
        if (column == null) { return; }
        column.Header = e.NewValue;
    }
}