DataGrid | Mesour DataGrid for Nette with options | Grid library

I'm writing an app in WPF, trying to use the MVVM-design pattern (which is new to me). I have a DataGrid bound to an ObservableCollection.

Delete the currently selected DataGrid-row using a 'Delete'-button. I've tried a plethora of forum-posts and videos to find a solution. The solution has probably stared me right in the face several times, but at this point I'm more confused than I was when I first started.

Any assistance would be appreciated.

ViewModel (updated with working code, thanks to EldHasp):

I'm creating a WPF Molds app that contains 2 windows: MainWindow with DataGrid, and AddEditWindow which allows to Add/Edit Molds.

I have a EditButton which located in a TemplateColumn of DataGrid:

I'm using Avalonia.Controls.DataGrid. By default, when the grid has focus and Enter is pressed, it automatically handles the event and moves the selection to the next item. How can I prevent this default behavior? I'd like to have a custom Enter KeyDown handler instead.

I got a button (using MaterialDesign theme) in a WPF form button that is not styling correctly, where am I going wrong?. The button in the DataGrid is fine. I tried near Window on mainWindow doing Foreground="white" but when I take the theme off everything returns to nornal WPF form with the text colour (lower right) missing

app.xamp:

I have an application with two DataGrid controls. And although their ItemsSource are bound to different collections, their item type, columns, styles and event handlers are exactly the same.

As their XAML codes are growing bigger and bigger, how can I create the same "content" and reuse it in both DataGrids?

What I currently have is:

How can I resize a * column in the XamDataGrid? In this example, I cannot resize the department column.

MWE: MainWindow.xaml

I have a class with a property 'DesignParameters' that upon changing, would affect another property called 'AxialMomentDataLists'. However, the 'DesignParameters' is comprised of a bunch of other 'child' properties that are accessible through a datagrid on the UI and also implement property changed. If one of the child properties changes, I also want 'DesignParameters' to automatically update, which would in-turn call for a new 'AxialMomentDataLists' to be set. Does anyone have advice on the best method to achieve this?

When user enter the barcode of datagrid's first column database fetches required data (PRODUCT_NAME and PURCHASE_PRICE). I want to put it in the related cell data i have.

I can get the data what i want but i dont know how to set of selected item's PRODUCT_NAME and PURCHASE_PRICE cell.

XAML

I’m building a WPF C# application that has multiple DataGrids bound to their respective ObservableCollections that contain objects.

I will focus on the DataGrid that binds to the Conduits ObservableCollection to keep things simple.

The DataGrids are set to multi select SelectionMode="Extended". The data in the DataGrids is also represented in a 2D view via a Canvas and drawing elements.

The idea is the user can select the objects in 2D or the DataGrids, as a single item, or multiple items/rows, and the DataGrid row, or object in 2D will be highlighted.

This is producing some unstable results. Too many to list, so I will focus on deleting items. I can delete objects in the 2D without problem when the DataGrid ViewModels have not been initialized. Once they are initialized I get the following error when deleting in 2D.