Year Month Picker State
Parameters
initial Year
The initial year to be selected. Must be in 1000..9999.
initial Month
The initial month to be selected.
Creates a YearMonthPickerState from initialYearMonth.
constructor(initialDate: LocalDate)
Creates a YearMonthPickerState from the year/month portion of initialDate.
The day value is ignored because YearMonthPicker only selects year and month.