Sets the type of picture that the box should display.
The legal values are "Automatic", "GIF", "JPEG", "Metafile", "StandardForm", and "TraditionalForm". The values "Automatic", "GIF", "JPEG", and "Metafile" specify a graphics format. If you use one of these, then the MathCommand property should be something that evaluates to a Graphics expression (or Graphics3D, SurfaceGraphics, etc.) It must
// BAD myMathPictureBox.MathCommand = "Plot[x, {x,0,1}];"; // GOOD myMathPictureBox.MathCommand = "Plot[x, {x,0,1}]";The "Automatic" setting is the default, which assumes you are trying to display graphics, not typeset expressions, and it will automatically select the best graphics format. If you want the graphic to dynamically resize as the MathPictureBox is being resized, you should use the "Metafile" format.
The values "StandardForm" or "TraditionalForm" indicate that you want the result of the MathCommand to be typeset in that format and displayed. These settings are not used if you want a Mathematica plot or other graphic.
MathPictureBox Class | Wolfram.NETLink.UI Namespace | MathCommand