fnReturn = function(mConfig) {
			return (typeof mConfig[sKey] == "function") ? mConfig[sKey].call(mConfig, vParam1, vParam2, vParam3, vParam4) : mConfig[sKey];
		}
Returns the plugin configuration of the control.
If the configuration is a type of function, then it gets executed.

@param {string} sKey The configuration key
@param {any} [vParam1] The first parameter if the sKey configuration is a type of function
@param {any} [vParam2] The second parameter if the sKey configuration is a type of function
@param {any} [vParam3] The third parameter if the sKey configuration is a type of function
@param {any} [vParam4] The fourth parameter if the sKey configuration is a type of function
@returns {*} The plugin configuration of the control, otherwise undefined
@protected