'Properties' object passed into the WL.fileDialog method.
The color pallette to use for the file picker. Specify "white", "grey", or "transparent".
Specifies the type of SkyDrive file picker to display. Specify "open" to display the download version of the file picker. Specify "save" to display the upload version of the file picker.
Specify only if the mode property is set to "open". Specifies how many files the user can select to download. Specify "single" for a single file. Specify "multi" for multiple files.