Question

when a user presses the full-screen button all of the items stays in the upper left corner.
i want to prevent this and keep the window as-is just in full-screen.

Answer 1

Full Screen Mode

C# :

WindowStyle = WindowStyle.None;
WindowState = WindowState.Maximized;

XAML :

< Window ... WindowStyle="None" WindowState="Maximized" ... /> 

---

Kepping Windows Proportions

XAML :

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />         // Auto Rule
        <RowDefinition Height="*" />            // Star Rule
        <RowDefinition Height="100" />          // Fixed Rule
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto" />       // Auto Rule
        <ColumnDefinition Height="*" />         // Star Rule
        <ColumnDefinition Width="100" />        // Fixed Rule
    </Grid.ColumnDefinitions>
</Grid>  

Rules :

• Fixed

  Fixed size of logical units (1/96 inch)

• Auto

  Takes as much space as needed by the contained control

• Star

  Takes as much space as available (after filling all auto and fixed sized columns)

Grid lets you enjoy both worlds – As long as you’re putting all elements into a single cell, you get both: Arbitrary positioning and auto-sizing.

Please refer to this tutorial, for using Rows and Columns