I am trying to have focus on a datagrid while typing in a search textbox below to filter the data in grid

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WPF

DataGrid

TextBoxBase

I am having a certain problem in filtering my data in a datagrid. For making data filteration in a datagrid user friendly I thought of a way but i dont know how to achieve it. The scenario is I have a datagrid with a textbox for every colomn in the datagrid. So now when a text is entered in the textbox specified for a column in the datadgrid the data in the datagrid will be filtered accordingly. So what I need is my focus will be on the datagrid row or column while I should still be able to enter text in the textbox, which in turn will fire the textbox-textchange event and my data in datagrid will be filtered accordingly. while doing this i should be able to scroll up down using arrows keys to move the focus within the datagrid browsing the data and if Enter key is pressed then that datagridrow will be selected. All this happening together while typing in textbox simultaneously filtering data in the datagrid.
Can you help me please in this context. I have an image of what i want if u need i can show, I dont know if I can upload that image Here, I dont find that option.
Thank you