Link buttons to a toolbar
pixelpos = lm_link2toolbar(h, hframe, pixelpos, normpos, direction)
h: list of toolbar button handles hframe: modelit.layout.Frame to print these buttons in pixelpos: initial pixelposition normpos: normalized position direction: direction to plot buttons in 1: Left to Right, -1: Right to Left
pixelpos: final pixel position. Input for next call to lm_link2toolbar