，你可以下載微軟絲帶WPF源代碼（http://www.microsoft.com/en-us/download/details.aspx?id=11877）和一個DependencyProperty寬度/高度添加到ApplicationMenu或只是做了「快速和骯髒」像在我的例子：
MainWindow.xaml
public partial class MainWindow : RibbonWindow
{
private Size DefaultApplicationMenuSize;
public MainWindow()
{
InitializeComponent();
}
private void RibbonWindow_Loaded(object sender, RoutedEventArgs e)
{
var grid = (myRibbon.ApplicationMenu.Template.FindName("MainPaneBorder", myRibbon.ApplicationMenu) as Border).Parent as Grid;
/* before the first opening of the menu the size is NaN, so you have to measure size and use the DesiredSize */
grid.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
this.DefaultApplicationMenuSize = new Size(grid.ColumnDefinitions[2].Width.Value, grid.DesiredSize.Height);
}
private void RibbonApplicationMenuItem_MouseEnter(object sender, MouseEventArgs e)
{
Button b=new Button();
b.Content = "my epic button";
b.Width = 500;
b.Height = 500;
b.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
SetApplicationMenuSize(b.DesiredSize);
this.ribbonContentPresenter.Content = b;
}
private void RibbonApplicationMenuItem_MouseLeave(object sender, MouseEventArgs e)
{
SetApplicationMenuSize(DefaultApplicationMenuSize);
this.ribbonContentPresenter.Content = null;
}
private void SetApplicationMenuSize(Size size)
{
var grid = (myRibbon.ApplicationMenu.Template.FindName("MainPaneBorder", myRibbon.ApplicationMenu) as Border).Parent as Grid;
/* you can modify the width of the whole menu */
//grid.Width = size.Width;
/* or just the size of RibbonApplicationMenu.AuxiliaryPaneContent */
grid.ColumnDefinitions[2].Width = new GridLength(size.Width);
grid.Height = size.Height;
}
}
MainWindow.xaml。CS
<ribbon:RibbonWindow x:Class="WpfRibbonApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:ribbon="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary"
Title="MainWindow"
x:Name="RibbonWindow"
Width="640" Height="480"
Loaded="RibbonWindow_Loaded">
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ribbon:Ribbon x:Name="myRibbon">
<ribbon:Ribbon.ApplicationMenu>
<ribbon:RibbonApplicationMenu SmallImageSource="Images\SmallIcon.png">
<ribbon:RibbonApplicationMenuItem Header="Hello _Ribbon"
ImageSource="Images\LargeIcon.png"/>
<ribbon:RibbonApplicationMenuItem Header="HoverTest"
ImageSource="Images\LargeIcon.png"
MouseEnter="RibbonApplicationMenuItem_MouseEnter"
MouseLeave="RibbonApplicationMenuItem_MouseLeave"
StaysOpenOnClick="True" />
<ribbon:RibbonApplicationMenu.FooterPaneContent>
<ribbon:RibbonButton Label="What ever" HorizontalAlignment="Right"/>
</ribbon:RibbonApplicationMenu.FooterPaneContent>
<ribbon:RibbonApplicationMenu.AuxiliaryPaneContent>
<ribbon:RibbonContentPresenter Name="ribbonContentPresenter" />
</ribbon:RibbonApplicationMenu.AuxiliaryPaneContent>
</ribbon:RibbonApplicationMenu>
</ribbon:Ribbon.ApplicationMenu>
</ribbon:Ribbon>
</Grid>
</ribbon:RibbonWindow>
有一個愉快的一天
通過截斷我的意思是輔助的窗格不夠寬，以適應我的文件名。 – KrisTrip