How to display cross currencies in MT4

Hi All,

I'm looking for a technique of displaying a chart on MT4 that will behave just like any other chart, (will allow me to attach indicators to it and automatically update in realtime) but will not be on a currency pair that is provided by the broker.

For example, let's say that the broker provides the following pairs: EURUSD & GBPUSD but does not provide: EURGBP

I'd like to create a chart in MT4 that would display to me the EURGPB chart assuming that I fed it with the prices from both the EURUSD and GBPUSD pairs.

Any ideas on how to do this?

Thanks.

PS. This is just a hypothetical example, I know that most brokers provide the EURGBP pair, but I don't of a broker that provides PLNJPY, or other exotic pairs but they do provide currency pairs that could be used to generate such charts.

You can create an offline chart and have it updated by an EA attached to a live chart.
This article tells you how to do it. You should be able to modify the approach to create a cross-rate chart. http://articles.mql4.com/136

Sorry to be asking, but I thought that off-line charts do NOT get updated automatically as new quotes come in?

Offline charts do get updated automatically, they are reading from the same csv data.

No they don't since there are no quotes. That is why you need an EA set up on a live chart to periodically refresh the off-line chart.

"No they don't since there are no quotes."

If there are no quotes, obviously not. However, the question was whether offline charts get updated as new quotes come in. If there are new quotes being downloaded, they will be considered for the offline chart.

The offline chart must be told to do a refresh. That is done with a PostMessage win32 api call.
see line 303+ in PeriodConverter:
if(hwnd == 0) {
//trying to detect the chart window for updating
hwnd = WindowHandle(Symbol(), NewPeriod);
}
if(hwnd!= 0) {
if (IsDllsAllowed() == false) {
//DLL calls must be allowed
DebugMsg("Dll calls must be allowed");
return (-1);
}
if (PostMessageA(hwnd,WM_COMMAND,CHART_CMD_UPDATE_DATA,0) == 0) {
//PostMessage failed, chart window closed
hwnd = 0;
} else {
//PostMessage succeed
return (0);
}
}
//window not found or PostMessage failed
return (-1);

This thread is about creating charts for instruments not quoted by the broker. Hence no quotes, at all, ever.