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Custom Window with all sides Grip

Recently I want to make a custom window with WPF for my program.
Here is the code of the Window:
<Window x:Class="Test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Test"
mc:Ignorable="d"
Title="Test" Height="450" Width="850" Background="Transparent" AllowsTransparency="True" WindowStartupLocation="CenterScreen" ResizeMode="CanResizeWithGrip" WindowStyle="None">
</Window>
I want to recreate a titlebar that I set the WindowStyle to None.
Now I need to resize the window with the grip. However, the Grip will not work anymore if I set the WindowStyle to None.
In spite I can set the ResizeMode to CanResizeWithGrip. Whereas, it only works on the bottom right side of the Window.
I want to make the Grip work all sides of the window. How can I achieve it?

You can set the ResizeBorderThickness property of a WindowChrome to make a custom window resizable:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800" WindowStyle="None">
<WindowChrome.WindowChrome>
<WindowChrome CaptionHeight="0" ResizeBorderThickness="5" />
</WindowChrome.WindowChrome>
<Grid Background="Yellow">
<TextBlock>Resizable window...</TextBlock>
</Grid>
</Window>

Extended WPF Toolkit™ by Xceed, Zoombox ZoomOrigin not working (wpf)

I'm trying to set the ZoomOrigin of the Zoombox in the xaml, but if I set a coordinate, it will not zoom anywhere.
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<xctk:Zoombox x:Name="zoom" ZoomOrigin="20,20">
<Image Source="Green.png" Height="200" Width="200"/>
</xctk:Zoombox>
</Grid>
</Window>
I just want the origin of the zoom to be a set of coordinates decided by me, not by default.
Without setting ZoomOrigin it zooms in the middle of the zoom box - where I put the mouse cursor doesn't matter since the zoom will only occur in the middle of the box.
Trying to set the ZoomOrigin to a value breaks everything and it stops zooming.

Adding a Usercontrol with a transparent Background to a Window

I have created a UserControl with some rounded edged Border as first real element. The actuall Background is transparent.
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:QP_WPF" x:Class="GUI_WPF_Interior"
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
xmlns:themes="clr-namespace:Xceed.Wpf.Toolkit.Themes;assembly=Xceed.Wpf.Toolkit"
mc:Ignorable="d"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
d:DesignWidth="600
" Background="transparent">
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="ColorsAndBrushes.xaml" />
<ResourceDictionary Source="ControlTemplates.xaml"/>
</ResourceDictionary.MergedDictionaries>
</UserControl.Resources>
<Border Margin="10" Background="{StaticResource BG_GradientBrush_2}" CornerRadius="12,12,12,12">
....
(the Margin is only to provide a better visual for the problem)
Now I want to display this UserControl in a window. But the area that is used by the margin and the rounded edges stays white.
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:qp="clr-namespace:QP_WPF;assembly=QP_WPF"
Title="MainWindow" Height="680" Width="600"
WindowStyle="None"
AllowsTransparency="True"
MouseLeftButtonDown="Window_MouseLeftButtonDown">
<Grid Background="Transparent">
<qp:GUI_WPF_Interior x:Name="GUIInterior" Background="Transparent"/>
</Grid>
</Window>
What do I need to doe so that the Window only displays my UserControls parts that are not transparent?

Try to add also background=transparent to the window besides AllowTransparency

Create window in screen size in wpf

I create a window in wpf and in xml file I write this code:
<Window x:Class="WPFTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<Grid >
</Grid>
</Window>
But when I run the project, the size of window is 1080*625. I expect the window size become the screen size, but isn't. Why?

You need to set WindowState to Maximmized:
<Window x:Class="WPFTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" WindowState="Maximized"/>

hide control while resizing window in wpf

I'm trying to hide a control during a window resize because it's not behaving right otherwise. However in WPF there doesn't seem to be any OnBeginResize-ish event.
Any suggestions how to achieve this in WPF?

Bind a property(Notifiable) to your window width so when the width changes Setter of this property will be invoked and within this setter you can have the logic to hide your control.
<Window x:Class="SiemensEnergy.Frw.Main.Client.UI.Views.MainWindowView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:viewmodel="clr-namespace:SiemensEnergy.Frw.Main.Client.UI.ViewModels"
Title="MainWindow" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
Width="{Binding WindowWidthProperty, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
</Window>

Window_SizeChanged?
<Window x:Class="TestControls.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:m="clr-namespace:WFControls;assembly=WFControls"
xmlns:ff="clr-namespace:WFControls.Fernfracht;assembly=WFControls"
Title="MainWindow" Height="350" Width="525" SizeChanged="Window_SizeChanged">
<DockPanel>
</DockPanel>
</Window>