Buttons looks disabled until I click something

I have a button bound to a ICommand

<Button Content="Remove" Command="{Binding RemoveCommand}" x:Name="btnRemove" Visibility="Collapsed" />

After some tasks is done, I made the button visible, except开发者_如何学运维 that they look disabled until I click something, why is that? The RemoveCommand looks like below

public ICommand RemoveCommand
{
    get
    {
        if (_removeCommand == null)
        {
            _removeCommand = new RelayCommand(() =>
            {
                if (RemoveRequested != null)
                    RemoveRequested(this, EventArgs.Empty);
            }, () =>
            {
                // CanExecute Callback
                if (Status == WorkStatus.Processing || Status == WorkStatus.Pending)
                {
                    Debug.WriteLine("Returning False" + Status); return false;
                }
                Debug.WriteLine("Returning True"); return true; // After uploads, this returns True, in my Output Window. 
            });
        }
        return _removeCommand;
    }

after uploads, the CanExecute callback returns True, so button should be enabled, but it looks disabled till I click something, why is this happening?

Video of the Problem

Try CommandManager.InvalidateRequerySuggested().

This method should call the CanExecute() on the commands and that should update the IsEnabled of your buttons.

See http://msdn.microsoft.com/en-us/library/system.windows.input.commandmanager.invalidaterequerysuggested.aspx for more information.

If CommandManager.InvalidateRequerySuggested() does not do the job, try forcing the focus on the control containing the buttons at the appropiate time (MouseEnter, Loaded...):

//void ParentControl_MouseEnter(object sender, MouseEventArgs e)
void ParentControl_Loaded(object sender, RoutedEventArgs e)
{
    this.Focusable = true;
    this.Focus();
}

It might not be the most elegant solution but worked for me.