How change scroll focus between many DataGridViews in C#?

Question

So, i have this form which contains : a textBox , two dataGridViews and two buttons .

The dataGridViews are filled with data.

What i want is to scroll one of the dataGridViews vertically when the mouse cursor is on it.

I try a solution where i use the event MouseEnter of the the dataGridview and add the line

dataGridviewX.Focus();

for each dataGridView .

It works, but there was a problem ... , when i select the textBox to write and move the mouse on the dataGridViewX the textBox is "Dis-Focused" automatically , and that what i don't want!

SO, what is the proper way to do this, i mean scroll on any dataGridView without losing focus of the textBox ?

And Thank you very much for your time.