AEFastExpression_02.mel

global proc AEFastExpression(string $nodeName)
{
    editorTemplate -callCustom "CreateCustomControl" "UpdateCustomControl" "expression";
}

global proc CreateCustomControl(string $attrName)
{
    // command to create custom control
}

global proc UpdateCustomControl(string $attrName)
{
    // command to update custom control
}