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Changing property IsIndeterminate on MaterialDesign button in WPF

I'm using a material design button in WPF and I'm not quite sure how to control the property IsIndeterminate from within C# code as the below does not work, like it usually does with "standard" properties like Content etc.
BTN_Search.materialDesign:ButtonProgressAssist.IsIndeterminate = true;
The WPF for the button below:
<Grid Width="124" Margin="5" VerticalAlignment="Center">
<Button Style="{StaticResource MaterialDesignRaisedButton}"
materialDesign:ButtonProgressAssist.Value="-1"
materialDesign:ButtonProgressAssist.IsIndicatorVisible="True"
materialDesign:ButtonProgressAssist.IsIndeterminate="False"
Content="Search"
Margin="2,0"
IsEnabled="{Binding DataContext.ControlsEnabled, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"
x:Name="BTN_Search"
Click="Search_Click"/>
</Grid>
I want the materialDesign:ButtonProgressAssist.IsIndeterminate property to be changed in the Click event when the button is pressed and then once I am done processing I need to change it back to False.

It is a dependency property so it can be set like this:
ButtonProgressAssist.SetIsIndeterminate(BTN_Search, true);
There is other examples on Github in the MaterialDesignInXamlTooking project https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/blob/master/MaterialDesignThemes.Wpf.Tests/ButtonProgressAssistTests.cs

Hide Button but keep function - XAML

First I've tried to implement a Click Event to my Textbox. Unfortunately, it doesn't work with XAML.
So, my plan is to add a Button and whenever you click this Button, the textfield below should change it's letter (back to 1).
My idea was to put the button over the first textbox and to hide it, so that you see the first textbox.
But, if I set the button as hidden, my function doesn't work anymore.
Is there a solution to hide the button, but, still keep the function for the second textbox?

Hidden means control is loaded, takes up space on the screen, but won't be operational(clickable), so it doesn't help you.
You could edit the button's ControlTemplate and make it a simple Grid with Transparent background, without the Hidden part of course.
And last thing, you could add MouseDown function on your TextBox so you won't need the button at all.

If you use bindings and commands you have two ways:
<Button Command="{Binding ClickCommand}">
<Button.Template>
<ControlTemplate TargetType="Button">
<TextBlock Text="Some text"/>
</ControlTemplate>
</Button.Template>
</Button>
or
<TextBlock Text="Some text">
<TextBlock.InputBindings>
<MouseBinding Gesture="LeftClick" Command="{Binding ClickCommand}"/>
</TextBlock.InputBindings>
</TextBlock>

Got it!
.xaml:
<TextBox MinWidth="90" x:Name="txtBoden" TextChanged="TxtBoden_TextChanged"
PreviewMouseDown="txtBoden_MouseDown"></TextBox>
.cs:
public void txtBoden_MouseDown(object sender, MouseButtonEventArgs e)
{
txtFach.Text = "1";
}

Focus error in TextBox with AppBarButton - UWP

I am using this code to make a button in XAML within a MVVM project in UWP.
for this use this code:
<CommandBar Background="Yellow" >
<AppBarButton Label="Pruebas" Command="{Binding cmd_Process}" >
<AppBarButton.Icon>
<SymbolIcon Symbol="Setting"/>
</AppBarButton.Icon>
</AppBarButton>
</CommandBar>
At the moment of "clicking" the 'Command' the method that I need is executed in the ViewModel, but I have to send a content of a TextBlock to work with it in the ViewModel.
All good, but at the time of sending it sends me null, so that I do not send null I have to change the configuration of the Focus to the TextBlock, but I have to do it first, and then execute the Command.
If I use a normal button to link the Command works perfect, but not with the AppBarButton.
How do I make the AppBarButton change the focus of the TextBlock before executing the Command? Or how do I control the fucus from the ViewModel, knowing that I have to call the page from the ViewModel class?

you can set the focus through ViewModel or even from your page class before executing the command or within the command function. with Control.Focus() method. more info in the links below :
https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.controls.control.focus
https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.input.focusmanager
https://learn.microsoft.com/en-us/windows/communitytoolkit/developer-tools/focustracker

You Can Lost the Focus in the TextBox with te property:
UpdateSourceTrigger=PropertyChanged
use into the TextBox... Example:
<TextBox x:Name="txt_Name" Header="Name:" Margin="5" Text="{Binding PropertyBindingToViewModel, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

Allow doubleClick on a textBox with IsEnabled = false

I have a TextBox.
I want it to be in the Disabled state, so that I can drag it. Once I double click it I want it back to be Enabled.
I can use ReadOnly property for this purpose. But If I use ReadOnly, then I am unable to Drag the TextBox, instead I get selection.
My actual reason for doing this is I want to use TextBox as TreeViewItem and I would like to allow features like Rename and Rearrange using drag-drop.
If anybody can suggest something like custom control that I can create and override some method?

I suggest to wrap the TextBox inside Grid. And set IsHitTestVisible to false for textBox. This will avoid all mouse events for TextBox. Now hook all your drag events to grid and it will work.
<Grid Background="Transparent" VerticalAlignment="Center">
<TextBox IsHitTestVisible="False" Margin="5" Text="Some text"/>
</Grid>

Is this concept of a button containing a textbox possible?

Recently I had been looking for a way to make the tabs in a TabControl editable and came across This example on telerik's website. That did exactly what I wanted but it got me thinking about a similar usage for buttons. I was wondering if it would be possible to use something like that and make a button that would show a textbox instead of the content presenter when say, you right click the button? I tried to make something like this work but so far have only ended up with a blank button.
<Button x:Name="SB" Height="222" Width="222" Click="SB_Click">
<ContentControl.ContentTemplate>
<DataTemplate>
<local:SuperButton Content="{Binding Path=x, Mode=TwoWay}"/>
</DataTemplate>
</ContentControl.ContentTemplate>
</Button>
Where x is a string variable and using the code behind from the link above (with a class name change, of course).
edit: This button will be in an itemscontrol, so I don't think naming the inner elements in xaml will work, but I do like the ease of Wolfgang's answer.

The WPF Content Model is really flexible and allows literally anything inside anything.
This is perfectly valid XAML:
<Button>
<TextBox/>
</Button>
Or even:
<Button>
<MediaElement Source="C:\Videos\WildLife.wmv"/>
</Button>

You can simply host a (e.g.) label (TextBlock) with the text AND a TextBox inside the Button and set their Visiblity properties.
That way, if you right click the button, the TextBox shows up.
<Button>
<Grid>
<TextBox Text=normal button caption" x:Name="label" />
<TextBox
x:Name="textbox"
Text="visible on right click"
MouseRightButtonDown="HandleRightClick"/>
</Grid>
</Button>
And then in your C# code create an event handler to set the Visiblity correctly.
void HandleRightClick(object sender, MouseButtonEventArgs e)
{
label.Visibility = Visibility.Collapsed;
textBlock.Visibility = Visibility.Visible;
}