def toggleTrans():
    # import and alias the relevant python libraries (only needed once in userSetup.py)
    # python libraries
    import maya.cmds as mc
    # get the currently selected object
    curSel = mc.ls(selection=True, dagObjects=True)
    # get the selections shading engine node
    curShader = mc.listConnections(curSel, source=True, type='shadingEngine')
    # get the current material node attached to it - note, this may not work on complex shaders and would need to be tested
    curMaterial = mc.listConnections(curShader, source=True, destination=False)
    # go through the returned nodes
    for item in curMaterial:
        # discard the transform node
        if mc.nodeType(item) != 'transform':
            # get the current transparency setting (quick hack here is just the red channel)
            curVal = mc.getAttr(item+'.transparency')
            # if its greater than zero then set it to zero (remove transparency)
            if curVal[0][0] > 0.0:
                mc.setAttr(item+'.transparency', 0.0, 0.0, 0.0, type='double3')
            # if its already zero then add some transparency
            else:
                mc.setAttr(item+'.transparency', 0.5, 0.5, 0.5, type='double3')

toggleTrans()

python("toggleTrans()");

# 1) open the script editor and copy the code below into it
def toggleXray():
    if mc.displaySurface(query=True, xRay=True) == [1]:
        mc.displaySurface(xRay=False)
    else:
        mc.displaySurface(xRay=True)


# 2) Now copy this into the script editor, highlight it and middle drag to your shelf.
# When asked what type of code it is choose Python. You should now have a toggle for xray on the selected objects
toggleXray()

int $xRayVar = `displaySurface -q -xRay`;
if ($xRayVar) {
    displaySurface -xRay false;
} else {
    displaySurface -xRay true;
};

vector $xRayVar3 = `displaySurface -q -xRay`;
if ($xRayVar3) {
    displaySurface -xRay false;
} else {
    displaySurface -xRay true;
};

{
//XRAY TOGGLE
string $cheese[] = `ls -sl -o -s -dag -l`;

for ($object in $cheese)
   {
        // lame test to see if it's geometry
	if ( `objExists ($object + ".doubleSided")`)
	{
		int $toggle[] = `displaySurface -q -xRay $object`;
		if ($toggle[0])
		   displaySurface -xRay 0 $object;
		else
	 	   displaySurface -xRay 1 $object;
	}
   }
}