Question

I am having a custom canvas derived from Canvas. It contains few ApplicationCommands like New/Open/Save etc. added like this –

this.CommandBindings.Add(new CommandBinding(ApplicationCommands.New, New_Executed, 
New_Enabled));

New_Enabled always returns true.

This control is used in a wpf project having a menu bar; New/Open/Save menu button’s are present in this menu bar with their Command set to respective ApplicationCommand like this –

<syncfusion:SimpleMenuButton
    x:Name="NewMenu"
    Icon="Images\New_Large.png"
    Label="New"
    IsEnabled="True"
    Command="{x:Static ApplicationCommands.New}"
    syncfusion:Ribbon.KeyTip="N">
</syncfusion:SimpleMenuButton>

Command works correctly when focus is present on Canvas but as soon as focus shifts to other control, New button gets disabled. I have tried setting CommandTarget to main window but that too doesn’t work.

Why this is happening and how can to make sure that New menu button will always be enabled?

Answer 1

@repka – Thanks for your response; I had already tried using canvas name as CommandTarget but it doesn’t work; Buttons gets enabled only when focus is on canvas as soon as i Click on some other control in window they gets disabled. I also tried using IsFocusScope but same result. Thanks for the command name strings tip.

I had to settle with this workaround, although I am not too happy with this –

    public WindowMain()
    {
        InitializeComponent();

        //Add commnad bindings
        //Need to do this to keep New/Open/Save/Run buttons always enabled
        //ToDo:[AJ] Look for better solution then this
        this.CommandBindings.Add(new CommandBinding(ApplicationCommands.New, this.TheCanvas.New_Executed, this.TheCanvas.New_Enabled));
        this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Open, this.TheCanvas.Open_Executed, this.TheCanvas.Open_Enabled));
        this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Save, this.TheCanvas.Save_Executed, this.TheCanvas.Save_Enabled));
        this.CommandBindings.Add(new CommandBinding(RTDesignerCanvas.Run, this.TheCanvas.Run_Executed));
    }