How do I...WPF Toolkit chart, Showing MinorTickMark datetime axis

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WPF

chart

WPF-Toolkit

I tried to design WPF chart same as below design image

problem is how can make background grid same as sample image, more column line between major tick's line

I found that there is MinorTickMarkStyle, I try to make style for it not shown

Here is both image of my control and design control sample

I put it as image link. Image

I am using WPF chart control from Wpftoolkit dll

So, Would you please help to make this minor line between major ticks in chart

regards