SystemColors | iOS app that shows all of the provided colors | iOS library

Goal: To align combobox popup to bottom Left. Kindly check image below for reference:

What i tried?: I tried playing with Placement property of PART_Popup. If i set Placement="Bottom", the Popup is rendering from Bottom right. Check this image below:

Also, in VS Designer it is showing correctly:

ComboBox PART_Popup:

Im pretty new to WPF. I needed to change the button mouseover colors so I right clicked the button, then copied the template. So Visual Studio got a lot of new lines into my App.xaml where I can now set the design of my button, looking like this:

I have an Expander and it should receive the full width of the column but I cant get it to work.

I tried to add the Horizontal(Content)Alignment = stretch on the TextBlock and on the Expander itself even on the Grid, but it is not working.

What I need is that the Expander takes about 90% of the width and the rest are assigned to the buttons as in the following example:

I want to display e.g. a name and when you press on it, expands down and shows additional information and if the buttons are pressed, then the commands behind the buttons will be executed (no commands are binded in the example).

I'm having trouble with design my apps on C# WPF because the design mode doesn't equal when I run the app.

If I run the app on windows 10 I get the difference like the image I attach (Button that says "CANCELAR"), but if I run on windows 2000 server it runs like design mode.

My code:

If I use a normal color like Red, it works. But if I use Transparent, it shows up as white when not focused, and blue when focused. Is there a special setting I have to enable for the window?

Here is the minimum code:

I'm creating this program that will act a a "toolbox" to help do some work quickly while on sites. It'll be a GUI with various buttons for actions. On it there is a place to add an IP of the system to perform actions on. I have one button where I am trying to copy a file from another pc to the one I am currently working on. However when I apply my code to the private section I get the error "expression must have a class type." I'm not sure where I am dropping the ball here.

I've been working on a project for a while that needs a command line in a panel. The user needs to be able to read it and execute commands to it.

I've got some solutions that sort of work like running a seperate thread then running a command process. I can then read what the command line says in the console however I can not work out how to execute commands to it.

Sorry that my question is redundant for instance with these ones:

• WPF Changing ListboxItem Highlight Color when Selected
• Why can't I set the background color of a selected ListBoxItem in WPF?

but for whatever reason neither changing the ItemContainerStyle, nor overriding the SystemColors works for me. Can someone tell me what I have to change in this XAML code to change the background color of selected ListBoxItems (or more precisely the ItemsContainer around them) to red? All the other colors that I set are assigned correctly.

I have this assignment where I must write an interactive program where the user clicks the screen and puts a dot at the spot of his mouse click and then when he puts a second dot they must connect with a line.