TextBox should occupy available space and not grow when filled with text

I do have a Grid with two columns and two rows. In the first column, first row I do have this:

<StackPanel  Orientation="Vertical" HorizontalAlignment="Stretch" Grid.ColumnSpan="1" Grid.Row="0" Grid.Column="0">
    <StackPanel  Orientation="Horizontal" H开发者_如何学Ceight="25" HorizontalAlignment="Stretch">
        <Label Content="Text:"/>
        <TextBox Name="TB_Text" HorizontalAlignment="Stretch" MinWidth="120" />
        <Button Name="BT_TextApply" Content="Apply" Width="75" HorizontalAlignment="Right" Click="BT_TextApply_Click" />
    </StackPanel>
</StackPanel>

I have "rows" (Horizontal StackPanels within a Vertical StackPanel) consisting of a Label, a Textbox and a button that belongs together.

The StackPanels got the attribute HorizontalAlignment="Stretch" so that they use the complete space within their Grid cell, this is OK.

But now I want my three elements also to fill the complete available space of the StackPanel, but I don't get it to work.

Current behaviour

• The Label has no width it occupies the space that the text in content needs, this is at the moment fine.
• The Textbox has a minimum width and gets bigger when I fill it with text,
• the button is on the right of the Texbox and is moved to the right when the TextBox gets bigger and disappears when it is moved outside the StackPanel

Wanted behaviour

• The Label has no width it occupies the space that the text in content needs, this is at the moment fine.
• The Button should have a fixed width (no problem) and should stick to the right border of my StackPanel, this is not working
• The TextBox should use the rest of the space in between and not more, even when filled with more text than fits in.

Is there something like a "max" attribute for my TextBox dependend on the size of the StackPanel?

Thanks stema. I didn't have the time to try it so I wasn't sure if that would work or not.

Instead of a StackPanel, have you tried using a DockPanel with last child fill set to true? If you dock the label left and the button right. Then ensure the textbox is the last child element of the dockpanel, I would think the size of the textbox would fill the remaining space if its HorizontalAlignment is set to stretch.

For completeness here is the solution I came up with using Josh's answer:

<StackPanel  Orientation="Vertical" HorizontalAlignment="Stretch" Grid.ColumnSpan="1" Grid.Row="0" Grid.Column="0">
    <DockPanel  Height="25" HorizontalAlignment="Stretch" LastChildFill="True">
        <Label Content="Text:" DockPanel.Dock="Left"/>
        <Button Name="BT_TextApply" Content="Apply" Width="75" DockPanel.Dock="Right" Click="BT_TextApply_Click" />
        <TextBox Name="TB_Text"/>
    </DockPanel>
</StackPanel>

The important parts are: The DockPanel needs the attribute LastChildFill="True", then list the items in the DockPanel that should "dock" somewhere and tell them to dock DockPanel.Dock="Left" and DockPanel.Dock="Right" and as last item, place that one that should occupy the remaining space. (The attribute HorizontalAlignment="Stretch" seems not to be needed for the last element, I can't see a difference if its there or not.)