WPF binding Width to Parent.Width*0.3

Question

I want to bind a control\'s Width to the parent\'s Width, but to a certain scale. Is there a way to do something like this:

Answer 1

I'd recommend simply doing this in XAML using a grid columns and the * width type:

You can change the ratio of how much the columns take up by changing the numbers before the * in the column widths. Here it's setup as 1 and 2, so the grid will be split in 3 (sum of all * widths), with 1/3 of width to first column and 2/3 to second column.