Plotting Coloured Volume Bars in Metastok Charts

Dear Metastock Users,

Is there anyone who could help me out to the write the following formula...

1.When Close is Higher than the Previous Close
2.When Close is Lower than the Previous Close
3.When Close is the Same as the Previous Close
4.When is Close equal to Open

I want to plot coloured volume bars for No.
1.Blue
2.Red
3. Brown
4. Brown

I greatly appreciate if any expert here help me out.
Thank you in advance.

Plotting Coloured Volume Bars in Metastok Charts