const static char* DOUBLE_WDG_MAX = "max";
const static char* DOUBLE_WDG_STEP = "step";
const static char* DOUBLE_WDG_DEFAULT_COMPUTED = "computed";
+const static char* DOUBLE_WDG_ACCEPT_EXPRESSIONS = "accept_expressions";
// WDG_TOOLBOX/WDG_SWITCH properties
const static char* CONTAINER_PAGE_NAME = "title";
const static char* CONTAINER_PAGE_ICON = "icon";