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Jul 12

Written by: kchristo
Thursday, July 12, 2012  RssIcon

This is the most recent comment in the Application Logo Sample post:
“Hi Kostas,
I wanted to find out if there is a way of opening an active screen as soon as I click on the logo. I have tried but my attempt was in vain. If it is possible, could you please help me out?

My first reaction was to ask for details (typical way of buying time Smile). But then I though I could do the changes required and post a new article. So simply put, this is the answer I propose to Darryn:
public static void AddLogo(this Microsoft.LightSwitch.Client.IClientApplication application, System.Windows.HorizontalAlignment alignment, string screenName) {
Microsoft.LightSwitch.Threading.Dispatchers.Main.BeginInvoke(() => { LogoPlacement.AddLogo(application, System.Windows.Application.Current.RootVisual, alignment, screenName); });

private static class LogoPlacement
internal static void AddLogo(Microsoft.LightSwitch.Client.IClientApplication application, UIElement element, System.Windows.HorizontalAlignment alignment, string screenName) {
if (rcb != null) return;

for (int i = 0; i < System.Windows.Media.VisualTreeHelper.GetChildrenCount(element); i++) {
if (rcb != null)
UIElement child = (UIElement)System.Windows.Media.VisualTreeHelper.GetChild(element, i);
AddLogo(application, child, alignment, screenName);
if (element is Microsoft.LightSwitch.Runtime.Shell.Implementation.Standard.RibbonCommandBar) {
rcb = element as Microsoft.LightSwitch.Runtime.Shell.Implementation.Standard.RibbonCommandBar;
Image myImage = new Image() {
Stretch = System.Windows.Media.Stretch.Uniform,
Margin = new Thickness(2, 8, 14, 8),
HorizontalAlignment = alignment,
Cursor = System.Windows.Input.Cursors.Hand
myImage.SetValue(ComponentViewModelService.ViewModelNameProperty, "Default.LogoViewModel");
myImage.SetBinding(Image.SourceProperty, new System.Windows.Data.Binding { Path = new PropertyPath("Logo") });
if (!string.IsNullOrWhiteSpace(screenName))
myImage.MouseLeftButtonUp += (s, e) => { application.Details.Dispatcher.BeginInvoke(() => application.Details.Methods[string.Format("Show{0}", screenName)].CreateInvocation().Execute()); };
myImage.SizeChanged += (s, e) => {
double left = (s as Image).HorizontalAlignment == HorizontalAlignment.Left ? e.NewSize.Width + 10.0 : 0.0;
double right = (s as Image).HorizontalAlignment == HorizontalAlignment.Right ? e.NewSize.Width + 10.0 : 0.0;
rcb.Padding = new Thickness(left, 0, right, 0);

With bold I have marked the additions/changes I had to make to accommodate Darryn’s request.
I hope Darryn is happy Smile with tongue out.


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Microsoft Visual Studio is a registered trademark of Microsoft Corporation / LightSwitch is a registered trademark of Microsoft Corporation