WPF

<Window x:Class="ButtonTest.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:command="clr-namespace:ButtonTest"
    Title="Window1" Height="300" Width="300">
    <Window.CommandBindings>
        <CommandBinding
            Command="{x:Static command:Stetics.uiCommand}"
            Executed="CommandBinding_Executed"
            CanExecute="CommandBinding_CanExecute"/>
    </Window.CommandBindings>
    <Grid>
        <Button Height="50" Width="100" Command="{x:Static command:Stetics.uiCommand}"></Button>
    </Grid>
</Window>

namespace ButtonTest
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
        {

        }

        private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = true;
        }
    }
}

using System.Windows.Input;

namespace ButtonTest
{
    public static class Stetics
    {
        public static RoutedUICommand uiCommand = new RoutedUICommand();
    }
}

while (true)
{
   ObservableCollection<int> collection = new ObservableCollection<int>();
}

<Style TargetType="{x:Type Button}"><br />
...<br />
</Style>

<ResourceDictionary><br />
            <ResourceDictionary.MergedDictionaries><br />
                <ResourceDictionary Source="Styles.xaml" /><br />
            </ResourceDictionary.MergedDictionaries><br />
        </ResourceDictionary>

<ResourceDictionary><br />
<ResourceDictionary.MergedDictionaries><br />
<ResourceDictionary Source="/YourCompanyName.WPF.Styles;component/MainDictionary.xaml" /><br />
</ResourceDictionary.MergedDictionaries><br />
</ResourceDictionary>