Setting Paint Weight Tool Options Through Mel

[rgkovach]

I'm trying to write a simple MEL script that essentially toggles the Paint Skin Weights Tool between Add and Subtract mode by setting positive and negative values in the Value and Min/Max Value fields.

I'm running into a small glitch however while setting the Value field. The Value field can only be a number that exists between the Min and Max Values, so it follows I need to set those before I can set the Value field. However, this very simple example doesn't work.

CODE
artAttrSkinPaintCtx -e -minvalue -1 -maxvalue 0 currentCtx;
artAttrSkinPaintCtx -e -value -0.1 currentCtx;
// Result: artAttrSkinContext //

The Min/Max Value fields get updated correctly, but the Value field goes to 0.
If I run each line separately, it works.

CODE
artAttrSkinPaintCtx -e -minvalue -1 -maxvalue 0 currentCtx;
// Result: artAttrSkinContext //
artAttrSkinPaintCtx -e -value -0.1 currentCtx;
// Result: artAttrSkinContext //

Whats stumping me is why when i execute the two lines together, I get one result rather that one result for each line.