Problem of inheritance

[giorgik]

Hello everyone, I am a inheritance problem with Qt 5.0.1. I have a class declared as:

class WorldGui : public World, public MainWindow

class WorldGui : public World, public MainWindow

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in the MainWindow class I have a function:

void MainWindow::fileLoadCb()

void MainWindow::fileLoadCb()

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that is called through the mechanism of Signal/Slot of MainWindow.
Within this function I would want to call a function of WordlGui

Load( filename );

Load( filename );

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how can I do ?
I could get an example of code that tell me how to do ?
I'm going crazy with this problem, which I think is not that difficult, but I can not find the solution.