...
template<class T>
class DateTimeCtrl : public T {
	MultiButtonFrame drop;
	CalendarClock cc;
...

	void OnDrop() {
		if(!this->IsEditable())
			return;

		Size sz = cc.GetCalendarClockSize();

		int width = sz.cx;
		int height = sz.cy;

		//Rect rw = Ctrl::GetWorkArea();
		Rect rw = this->Ctrl::GetWorkArea();

               // Note: I have to add this-> to satisfy the compiler.
...

String ArrayCtrl::AsCsv(bool sel, int sep, bool hdr)
{
	//char h[2] = { sep, 0 };  // [ -fpermissive]
	char h[2] = { (char)sep, 0 };
        ...
}

String Decode64(const String& s)
{
...
	for(;;)
	{
		byte ea = *p++ - ' ' - 1, eb = *p++ - ' ' - 1, ec = *p++ - ' ' - 1, ed = *p++ - ' ' - 1;
		//byte out[3] = { (ea << 2) | (eb >> 4), (eb << 4) | (ec >> 2), (ec << 6) | (ed >> 0) }; // same -fpermissive
		byte out[3] = { byte((ea << 2) | (eb >> 4)), byte((eb << 4) | (ec >> 2)), byte((ec << 6) | (ed >> 0)) };

....