Object containing the view model data of the placeholders: placeholderName [Type: string] - the name of the placeholder. placeholderTitle: [Type: string] - the title of the placeholder to display as the container of the placeholder data. placeholderType: [Type: knockout.observable] - the type of the placeholder measureSelection: [Type: knockout.observable] - the selected measure of the placeholder hierarchySelection: [Type: knockout.observable] - The selected hierarchy of the placeholder measures: [Type: knockout.observableArray] - the available measures of the placeholder hierarchies: [Type: knockout.observableArray] - the available hierarchies of the placeholder.